There's also Yma Sumac, who coincidentally had a Google Doodle the other day. Freakish vocal range.
While I like your list, I don't think I would call it "more recent ones".
I'll give you Jones, but Whitney (died in 2012), Parton (70), Nicks (68) and Slick (76) aren't what I'd call recent.
Kate Bush
good call. one her best songs on one of her best albums (Kick Inside)
Renaissance's Annie Haslam, very delightfully distinctive: